Geologicheskii Vestnik

A detailed study of mineralogy of the rocks of Shatak complex showed that all the variety of mineral associations within the complex was formed at several stages of formation and transformation of volcanicsedimentary deposits. It is shown that during the intrusion of magmatic melt into sedimentary deposits and/or the formation of stratifi ed volcanic-sedimentary deposits (“layered cake” type), thorium-rare earth mineralization is formed, represented by allanite, thorite, monazite, xenotime, and a signifi cant amount of unidentifi ed Th–REE compounds of complex composition. Based on the study of monazites, it has been established that REE mineralization in the terrigenous rocks of the Shatak complex was formed in a single process. This fact is confi rmed by a special type of isomorphism between Ca – Th – Ce in the monazite structure, as well as the diff erence of the “Shatak trend” from the other mechanisms of formation of rare earth minerals. It has been established that iron oxide and sulfi de-selenide mineralization, represented by magnetite, hematite, pyrite, chalcopyrite, bornite, claustalite, and iron and copper selenides, formed at the stage of syn- and postmagmatic metamorphic-hydrothermal redistribution of a number of elements at the fi nal stages of rock transformation rocks of the complex. The assessment of the thermobaric parameters of muscovite formation from the conglomerate horizons of the Kuz’elga Subformation indicates that the maximum temperature and pressure corresponded to T = ~470°C, P = ~8 kbar, and the minimum were: T = ~380°C, P = ~3 kbar. The relatively high temperature and pressure, as well as the spatial relationship of muscovite with chloritoid, suggest the existence of a postgenetic metamorphogenic stage in the history of the formation of rocks of the Shatak complex. At the same time, stress loading played a leading role in the transformation of the rocks.

Shatak complex, rare earth mineralization, sulfi des, selenides, iron oxide mineralization, metamorphism, hydrothermal process, thermobaric parameters

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